CN105514797A - Device and method for locking laser frequency of superfine energy-level spectrum based on two photons - Google Patents
Device and method for locking laser frequency of superfine energy-level spectrum based on two photons Download PDFInfo
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- CN105514797A CN105514797A CN201610018081.7A CN201610018081A CN105514797A CN 105514797 A CN105514797 A CN 105514797A CN 201610018081 A CN201610018081 A CN 201610018081A CN 105514797 A CN105514797 A CN 105514797A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
- H01S5/0657—Mode locking, i.e. generation of pulses at a frequency corresponding to a roundtrip in the cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/041—Optical pumping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
Abstract
The invention relates to a stabilization technology of laser frequency, in particular discloses a device and a method for locking the laser frequency of a superfine energy-level spectrum based on two photons. According to the device and the method, disclosed by the invention, a technology that femtosecond pulse pumping is combined with continuous laser is adopted; since a femtosecond pulse can be approximately considered as a linewidth-free laser, the linewidth of a two-photon spectrum is greatly reduced at the moment, and a narrow-linewidth two-photon spectrum is obtained; the laser frequency is stabilized by utilizing a spectrum line of the narrow-linewidth two-photon spectrum, so that the stability of the laser frequency and the robustness of a system can be greatly increased; the method is simple, is extremely wide in applicability and can be used for stabilizing various different-frequency lasers of which the width is from 300nm to 1500 nm; by adopting the method, an ultrastable-frequency laser of which the stability degree is 10<-9> in one second, 10<-10> in 30 seconds and 10<-11> in 300 seconds is obtained; the whole device has the advantages of simple structure, simpleness and convenience in operation, easiness in regulation, small external interference, high stability and extremely high accuracy degree.
Description
Technical field
The present invention relates to the stabilization technique of laser frequency, specifically a kind of laser frequency lock device and method based on the hyperfine energy level spectrum of two-photon.
Background technology
In modern society, acting in the military productive life daily with people of information is more and more important, Information more rapidly, more accurately, abundanter, also just grasped initiative thus military with productive life in obtain leading.Laser has significant advantage in space controlling and time controling, make the degree of freedom of its material to processing object, shape, size and processing environment all very large, be specially adapted to automation processing, laser-processing system combines with computer numerical control technology can form high-efficient automatic process equipment, the appearance of laser has caused a field information revolution, from VCD, DVD CD to laser photo-typesetting, the use of laser substantially increases efficiency, facilitates people and preserves and information extraction.Laser is as the important symbol of modern science and technology, be widely used at numerous areas such as entertainment, commercial Application and scientific researches, the stable of frequency is one of key property of laser, laser frequency stabilization has important meaning in the storage and Precision Machining of information, and this is more paid attention to regard to making the Frequency Stabilization Technique of laser.
Laser frequency stable to research high-resolution molecule and atom spectrum, laser interferometry, cool and capture atom, optical fiber communication, He Ne laser optics data storage are significant.At the initial stage of laser frequency stabilization, owing to just paying close attention to the regulation and control of parameter stability, operating state and surrounding environment, stability can only reach 10
-8the order of magnitude, produces little effect.After white field light first-class people's proposition methane adsorption line of middle nineteen sixties Japan carrys out stabilized lasers frequency, laser frequency stability is increased sharply, and reaches 10 very soon
-11the order of magnitude.The transition spectral line of atom, molecule is utilized to make laser frequency stabilization enter a new stage to the frequency locking laser.Therefore, usually the laser frequency-stabilizing method of laser frequency lock on the transition spectral line of atom, molecule being obtained frequency stabilization is adopted both at home and abroad, this method obtains frequency discrimination line by demodulation atom saturation-absorption spectrum and locks laser frequency, obtains good frequency stabilization effect.Now, the broadening effect of spectrum line masks the details of spectral composition, becomes the principal element that restriction laserfrequencystability improves.There are three factors in the broadening source of spectrum: the natural width of spectral line, pressure cause that (collision) is broadening, Doppler broadening.When pressure is less than 1333Pa(10mmHg) time, suppress broadening and not serious, have identical magnitude with natural width.Wherein Doppler broadening two orders of magnitude larger than natural width usually, are the main components of actual spectrum line width.Therefore, without Doppler broadening technology, laser frequency stabilization is had great importance.
Usually two kinds of methods are adopted to obtain without Doppler's spectrum both at home and abroad: one, cooling of atoms and molecular engineering.Two, atom two photon transition technology is adopted.Compared to cooling of atoms and molecular device is huge, the complicated and feature of costliness, the two photon transition technology of atom becomes the first-selection utilized without Doppler's spectrum-stable laser frequency because of its simplicity, stability, economy.Just because of the superiority of the consistent laser frequency aspect of two photon transition, two photon transition is used to frequency reference---the light clock of a new generation, and two-photon light clock is while significantly reducing system complexity, and frequency marking stability and robustness also improve greatly.The breadth of spectrum line without Doppler's spectrum utilizing atom two photon transition technology to obtain is determined by the live width of laser Output of laser.The atom two-photon spectral line that tradition obtains needs the continuous laser of use one or two semiconductor laser.Therefore, the live width of semiconductor laser output continuous laser determines the live width without Doppler's spectrum.But the laser linewidth of semiconductor laser is at megahertz (10
6hz) magnitude, makes the live width that cannot narrow two-photon spectrum further.
Summary of the invention
The present invention affects two-photon spectrum breadth of spectrum line to solve existing utilize the stabilization technique of atom and molecular spectrum laser to be subject to Doppler effect that atomic motion produces and acting on laser natural line width, to such an extent as to reduce the technical problems such as the frequency stabilization effect of laser, utilize femtosecond pulse pumping to combine with continuous laser and obtain narrow linewidth two photon transition optic spectrum line, provide a kind of laser frequency lock device and method based on the hyperfine energy level spectrum of two-photon.
Laser frequency lock device based on two photon transition exceed narrow line effect of the present invention realizes by the following technical solutions: a kind of laser frequency lock device based on the hyperfine energy level spectrum of two-photon, comprises semiconductor laser, is positioned at laser isolator on laser semiconductor emitting light path, the first half slide and the first polarization beam splitter prisms in turn; Transmitted light path along the first polarization beam splitter prism laser has the first convex lens, the second convex lens second half-wave plate and the second polarization beam splitter prism in turn; The transmitted light path of the second polarization beam splitter prism there are the first planoconvex lens, concavees lens and acousto-optic modulator successively; The concave surface facing acousto-optic modulator of described concavees lens; Acousto-optic modulator signal input part is connected with signal generator, the emitting light path of acousto-optic modulator is provided with successively 1/4th slides, the second planoconvex lens, anti-dazzling screen; The transmitted light path of the second planoconvex lens is also provided with can by the first completely reflecting mirror of the positive/negative first-order diffraction light reflective echo optical modulator of acousto-optic modulator outgoing; The reflected light path of the second polarization beam splitter prism is provided with successively the second completely reflecting mirror, the 4th completely reflecting mirror and the 3rd completely reflecting mirror, also comprises the femto-second laser of the reverse conllinear of reflected light path of an emitting light path and the 3rd completely reflecting mirror; 3rd be provided with between completely reflecting mirror and femto-second laser in establish the metallic magnetic radome of alkali metal atom vaporium; The side of metallic magnetic radome has laser first entrance port, and opposite side has laser second entrance port; The reverberation of the 3rd completely reflecting mirror and the emergent light of femto-second laser enter metallic magnetic radome respectively through first, second entrance port of laser and oppositely conllinear acts on alkali metal atom vaporium; Metallic magnetic radome also has phosphor collection mouth, phosphor collection mouth is provided with the 4th convex lens, narrow band pass filter and photomultiplier outward successively, photomultiplier tube signal output is connected with amplifier, amplifier signal output is connected with lock-in amplifier, a signal output part of lock-in amplifier is connected with oscilloscope, and another signal output part is connected with the Current Control port of semiconductor laser.
The ground state of the corresponding alkali metal atom of the laser frequency of described semiconductor laser is to the transition of a certain excitation state; The a certain excitation state of the corresponding alkali metal atom of femtosecond laser frequency that femto-second laser is launched is to the transition of another excitation state.So just can obtain two-photon spectrum via the 4th convex lens, narrow band pass filter and photomultiplier, and two-photon spectrum is used for the Frequency Locking of semiconductor laser.
Alkali metal atom two photon transition can be effectively excited with the frequency of maintenance femtosecond laser is constant by scanning continuous laser frequency, by metallic magnetic shielding case isolated magnetic field effectively, lens are adopted to collect the fluorescence of alkali metal atom spontaneous radiation, stray light in fluorescence is detected by photomultiplier after being leached by filter, namely obtains the narrow-band spectrum of alkali metal atom two photon transition.Narrow-band spectrum passes into lock-in amplifier and obtains the frequency that error signal gets final product stabilization of semiconductor laser after amplifier amplifies.The application can stablize the laser of the different frequency from 300nm to 1550nm, obtains the high-quality output beam of laser frequency stabilization.
The constant second step transition exciting alkali metal atom two photon transition as pump light of frequency of femtosecond laser, femtosecond laser frequency is constant eliminates the impact of frequency change on two-photon spectral line, all need to scan the broadening of spectral lines reducing frequency disturbance and bring compared to first and second step laser frequency of traditional two photon transition, the continuous laser of air exercise and femtosecond laser are eliminated background of doppler by two-photon effect and are obtained two-photon spectrum without background of doppler.Utilize acousto-optic modulator to be the frequency in order to scan laser outside on the basis not changing laser frequency in the frequency of external scan continuous laser, two time is change in order to bring laser direction after eliminating during scan laser frequency by acousto-optic modulator.
The structure that first planoconvex lens and concavees lens, acousto-optic modulator, 1/4th slides, the second planoconvex lens, anti-dazzling screen and the first completely reflecting mirror form can make laser pass through acousto-optic modulator two times, this structure is used for the frequency changing laser in outside, can the frequency constant basis of Output of laser frequency utilizing this structural outer scan laser kept by this structure laser, in addition laser two times by acousto-optic modulator can while scan laser frequency in assurance device light path do not change; The beam collimation structure of second, third and the 4th completely reflecting mirror is for improving the probability of laser excitation two photon transition, 4th convex lens are for collecting fluorescence in photomultiplier, amplifier is for amplifying obtained fluorescence signal, lock-in amplifier be used for by amplify after modulating and demodulating signal produce error signal, the error signal obtained is input to semiconductor laser and carries out frequency locking, and oscilloscope is used for monitoring two-photon spectrum and error signal.
Further, the 5th convex lens are provided with between laser first entrance port of the 3rd completely reflecting mirror and metallic magnetic radome; The 3rd convex lens are provided with between laser second entrance port of femto-second laser and metallic magnetic radome; Two incidence windows corresponding with continuous laser and femtosecond laser twice incident light on described alkali metal atom vaporium are brewster angle incidence window.
3rd and the 5th convex lens are used for center femtosecond laser and continuous laser being converged at atom vapor room, the incidence window of alkali metal atom vaporium is in vertical direction with Brewster's angle, and Brewster's angle can increase the transmissivity of laser and eliminate the broadening of spectral lines that the roundtrip of laser in alkali metal atom vaporium cause.
The invention provides a kind of laser frequency lock device based on the hyperfine energy level spectrum of two-photon, the structure of described device is simple, operate simple and easy, be not subject to ectocine, stable performance accuracy is high, this device not only eliminates background of doppler based on two-photon spectrum and its breadth of spectrum line has than other atoms and the narrower particular advantages of molecular transition spectral line, be combined into and keep laser frequency constant and two frequencies by scanning technique external scan laser utilizing acousto-optic modulator, the advantage of femtosecond laser narrow linewidth is utilized to eliminate because of the too wide broadening to two-photon spectrum of continuous laser live width, efficiently solve present stage cannot eliminate background of doppler basis on narrow spectral line width further, thus the problem of more stable laser frequency cannot be obtained.Whole device have structure simple, easy and simple to handle, be easy to regulate, external interference is little, stability is strong, accuracy is high advantage.
Laser frequency lock method based on two-photon hyperfine energy level spectrum of the present invention adopts following technical scheme to realize: a kind of laser frequency lock method based on the hyperfine energy level spectrum of two-photon, comprise the steps: that the continuous laser that (a) semiconductor laser exports produces positive/negative first-order diffraction light through acousto-optic modulator modulation, first completely reflecting mirror is by the positive/negative first-order diffraction light reflection of outgoing after acousto-optic modulator modulation, this reverberation is input to alkali metal atom vaporium by reflecting through multiple speculum and converged by the 5th convex lens again after acousto-optic modulator again, alkali metal atom is excited by ground state transition to some excitation state by the frequency of acousto-optic modulator scanning continuous laser, b femtosecond laser that femto-second laser is launched by () converges through the 3rd convex lens along the direction contrary with continuous laser and is input to alkali metal atom vaporium, makes the alkali metal atom transitting to some excitation state transit to again another excitation state, c () converges alkali metal atom spontaneous radiation fluorescence by the 4th convex lens, obtained the two-photon spectrum of alkali metal atom ground state-some excitation state-another excitation state transition by photomultiplier detection, d two-photon spectrum that () obtains obtains error signal through amplifier input lock-in amplifier, and the current-modulation end that error signal is input to semiconductor laser carrys out the frequency of stable shoot laser.
Compared to other spectral line of atom and molecule, atom two-photon spectrum of the present invention can eliminate background of doppler, and its breadth of spectrum line is much smaller than atom and other spectrum of molecule, and therefore two-photon spectrum has very large advantage in frequency stabilization.The appearance of femtosecond laser can eliminate the impact of continuous laser live width on spectrum.Here utilize femtosecond to combine with continuous laser first and replace in traditional double photon spectrum, using two to restraint continuous laser.Femtosecond laser can not be incorporated in two photon transition the characteristic that breadth of spectrum line impacts.The two photon transition narrow-band spectrum obtained can more accurate the frequency stabilization of laser.
This method obtains two-photon spectrum by the scanning of external acousto-optical modulator, the frequency of laser semiconductor remains unchanged, the error signal of frequency locking is input to semiconductor laser to laser essence frequency accurate lock, and the way of this external scan can improve the stability of laser.
This method can stabilized lasers frequency for a long time, and can cover the wavelength of 300nm to 1550nm due to the two photon transition of alkali metal atom, thus adopts the two photon transition of different energy levels just can stablize the laser of different frequency.This method is applicable to the laser stablizing numerous different frequency.
The technology that the present invention adopts femtosecond pulse pumping to combine with continuous laser, due to the laser (<Hz) regarded as without live width that femtosecond pulse can be similar to, now the live width of Shuangzi spectrum reduces greatly, obtains the two-photon spectrum of narrow linewidth.Utilize the two-photon spectral line stabilized lasers frequency of this narrow linewidth, the stability of laser frequency, the robustness of system can be improved greatly, and the simple and easy applicability of the method is extremely wide, can stablize the laser of the numerous different frequencies from 300nm to 1500nm.By adopting the method, we obtain 1 second stability is 10
-9, within 30 seconds, stability is 10
-10, within 300 seconds, stability is 10
-11frequency surpass stabilized laser.
Accompanying drawing explanation
The structural representation of Fig. 1 device of the present invention.
Fig. 2 is the rubidium atom 5S that the present invention obtains
1/2(F=2)-5P-5D
5/2two photon transition spectral line.
Fig. 3 is the Allan variance that stabilized lasers of the present invention obtains.1 second stability 10 shown in figure
-9, 30 seconds stabilitys 10
-10, 300 seconds stabilitys 10
-11.Can find out that to adopt the long-time stability of laser frequency after the method for the invention fabulous.
The level structure schematic diagram of Fig. 4 Cs atom.
The level structure schematic diagram of Fig. 5 rubidium atom.
In figure: 1-semiconductor laser, 2-laser isolator, 3-the first half slide, 4-first polarization beam splitter prism, 5-laser emitting mouth, 6-first convex lens, 7-second convex lens, 8-the second half slide, 9-second polarization beam splitter prism, 10-first planoconvex lens, 11-concavees lens, 12-acousto-optic modulator, 13-1/4th slide, 14-second planoconvex lens, 15-anti-dazzling screen, 16-first completely reflecting mirror, 17-the one BNC line, 18-signal generator, 19-second completely reflecting mirror, 20-femto-second laser, 21-the 3rd convex lens, 22-alkali metal atom vaporium, 23-metallic magnetic radome, 24-the 4th convex lens, 25-narrow band pass filter, 26-photomultiplier, 27-the 5th convex lens, 28-the 2nd BNC line, 29-amplifier, 30-the 3rd BNC line, 31-lock-in amplifier, 32-the 4th BNC line, 33-the 5th BNC line, 34-oscilloscope, 35-the 3rd completely reflecting mirror, 36-the 4th completely reflecting mirror, 37-cavity.
Embodiment
During practical application, also comprise the cavity 37 shell having laser emitting mouth 5, described semiconductor laser 1, laser isolator 2, the first half slides 3, first polarization beam splitter prism 4, first convex lens 6, second convex lens 7, the second half slides 8, second polarization beam splitter prism 9, first planoconvex lens 10, concavees lens 11, acousto-optic modulator 12, / 4th slides 13, second planoconvex lens 14, anti-dazzling screen 15, first completely reflecting mirror 16, signal generator 18, second completely reflecting mirror 19, 3rd completely reflecting mirror 35, 4th completely reflecting mirror 36, 5th convex lens 27, metallic magnetic radome 23, alkali metal atom vaporium 22, 3rd convex lens 21, femto-second laser 20, 4th convex lens 24, narrow band pass filter 25, photomultiplier 26, amplifier 29, lock-in amplifier 31, oscilloscope 34 is all positioned at cavity 37, the reflected light path of described first polarization beam splitter prism 4 is through laser emitting mouth 5 outgoing of cavity 37.
During work, cavity 37 plays isolated stray light and protection.All parts makes an intensive portable device after can being fixed position in cavity, convenient mobile, eliminates the complicated procedures of forming of assembling simultaneously, has saved the time.The laser that laser output 5 output frequency is stable.
Described acousto-optic modulator 12 is connected to signal generator 18 by a BNC line 17; Described photomultiplier 26 is connected to amplifier 29 by the 2nd BNC line 28, amplifier 29 is connected to lock-in amplifier 31 by the 3rd BNC line 30, and lock-in amplifier 31 is connected to semiconductor laser 1 and oscilloscope 34 by the 4th BNC line 32 and the 5th BNC line 33.
The first described completely reflecting mirror 16, second completely reflecting mirror 19, the 3rd completely reflecting mirror 35, the 4th completely reflecting mirror 36 are the completely reflecting mirror of plating high-reflecting film; Described first convex lens 6, second convex lens 7, the 3rd convex lens 21, the 4th convex lens 24, the 5th convex lens 27 are without plated film ordinary lens; Described metallic magnetic radome 23 is three layers of mu-metal magnetic shielding cover; The focal length of the 3rd convex lens is 15cm.
Rubidium atom vapor is filled with in described alkali metal atom vaporium; The continuous laser of described semiconductor laser 780nm; Femto-second laser launches 776nm femtosecond laser; Rubidium atom realizes the transition of the first step 5S-5P of two photon transition under the effect of semiconductor laser laser, the constant transition exciting the second step 5P-5D of rubidium atom two photon transition as pump light of frequency of femtosecond laser.The two photon transition spectral line of rubidium atom as shown in Figure 2.
Be the level structure schematic diagram of Cs atom and rubidium atom as shown in Figure 4,5 respectively, its level structure elaborate, can meet the needs of most semiconductor laser frequency locking.Semiconductor laser is used for alkali metal atom to be excited to some excitation state from ground state, as long as the emergent light frequency of femto-second laser meets, and this alkali metal atom is excited to another higher excitation state by this excitation state.So just can obtain at phosphor collection mouth the two-photon spectrum being used for frequency locking.
Claims (8)
1. based on a laser frequency lock device for the hyperfine energy level spectrum of two-photon, it is characterized in that: comprise semiconductor laser (1), be positioned at laser isolator (2) in semiconductor laser (1) laser emitting light path, the first half slide (3) and the first polarization beam splitter prisms (4) in turn; Transmitted light path along the first polarization beam splitter prism (4) laser is provided with the first convex lens (6), the second convex lens (7), the second half-wave plate (8) and the second polarization beam splitter prism (9) in turn; The transmitted light path of the second polarization beam splitter prism (9) there are successively the first planoconvex lens (10), concavees lens (11) and acousto-optic modulator (12); The concave surface facing acousto-optic modulator (12) of described concavees lens (11); Acousto-optic modulator (12) signal input part is connected with signal generator (18), the emitting light path of acousto-optic modulator (12) is provided with successively 1/4th slides (13), the second planoconvex lens (14), anti-dazzling screen (15); The transmitted light path of the second planoconvex lens (14) is also provided with can by first completely reflecting mirror (16) of positive/negative first-order diffraction light reflective echo optical modulator (12) of acousto-optic modulator (12) outgoing; The reflected light path of the second polarization beam splitter prism (9) is provided with successively the second completely reflecting mirror (19), the 4th completely reflecting mirror (36) and the 3rd completely reflecting mirror (35); Also comprise the femto-second laser (20) of the reverse conllinear of reflected light path of an emitting light path and the 3rd completely reflecting mirror (35); The metallic magnetic radome (23) of alkali metal atom vaporium (22) is established in being provided with between 3rd completely reflecting mirror (35) and femto-second laser (20); The side of metallic magnetic radome (23) has laser first entrance port, and opposite side has laser second entrance port; The reverberation of the 3rd completely reflecting mirror (35) and the emergent light of femto-second laser (20) enter metallic magnetic radome (23) through first, second entrance port of laser respectively and oppositely conllinear acts on alkali metal atom vaporium (22); (23) also have phosphor collection mouth with metallic magnetic radome, phosphor collection mouth is provided with the 4th convex lens (24), narrow band pass filter (25) and photomultiplier (26) outward successively, photomultiplier (26) signal output part is connected with amplifier (29), amplifier (29) signal output part is connected with lock-in amplifier (31), a signal output part of lock-in amplifier (31) is connected with oscilloscope (34), and another signal output part is connected with the Current Control port of semiconductor laser (1).
2. as claimed in claim 1 based on the laser frequency lock device of the hyperfine energy level spectrum of two-photon, it is characterized in that: between the 3rd completely reflecting mirror (35) and laser first entrance port of metallic magnetic radome (23), be provided with the 5th convex lens (27); The 3rd convex lens (21) are provided with between laser second entrance port of femto-second laser (20) and metallic magnetic radome (23); Upper two incidence windows corresponding with continuous laser and femtosecond laser twice incident light of described alkali metal atom vaporium (22) are brewster angle incidence window.
3., as claimed in claim 2 based on the laser frequency lock device of two photon transition exceed narrow line effect, it is characterized in that: also comprise the cavity (37) shell having laser emitting mouth (5), described semiconductor laser (1), laser isolator (2), the first half slides (3), first polarization beam splitter prism (4), first convex lens (6), second convex lens (7), the second half slides (8), second polarization beam splitter prism (9), first planoconvex lens (10), concavees lens (11), acousto-optic modulator (12), / 4th slides (13), second planoconvex lens (14), anti-dazzling screen (15), first completely reflecting mirror (16), signal generator (18), second completely reflecting mirror (19), 3rd completely reflecting mirror (35), 4th completely reflecting mirror (36), 5th convex lens (27), metallic magnetic radome (23), alkali metal atom vaporium (22), 3rd convex lens (21), femto-second laser (20), 4th convex lens (24), narrow band pass filter (25), photomultiplier (26), amplifier (29), lock-in amplifier (31), oscilloscope (34) is all positioned at cavity (37), and the reflected light path of described first polarization beam splitter prism (4) is through laser emitting mouth (5) outgoing of cavity (37).
4. the laser frequency lock device based on two photon transition exceed narrow line effect as described in any one of claim 1 ~ 3, is characterized in that: described acousto-optic modulator (12) is connected to signal generator (18) by a BNC line (17); Described photomultiplier (26) is connected to amplifier (29) by the 2nd BNC line (28), amplifier (29) is connected to lock-in amplifier (31) by the 3rd BNC line (30), and lock-in amplifier (31) is connected to semiconductor laser (1) and oscilloscope (34) by the 4th BNC line (32) and the 5th BNC line (33).
5. the laser frequency lock device based on two photon transition exceed narrow line effect as described in any one of claim 1 ~ 3, is characterized in that: described the first completely reflecting mirror (16), the second completely reflecting mirror (19), the 3rd completely reflecting mirror (35), the 4th completely reflecting mirror (36) are the completely reflecting mirror plating high-reflecting film; Described first convex lens (6), the second convex lens (7), the 3rd convex lens (21), the 4th convex lens (24), the 5th convex lens (27) are without plated film ordinary lens; Described metallic magnetic radome (23) is three layers of mu-metal magnetic shielding cover.
6. the laser frequency lock method based on the hyperfine energy level spectrum of two-photon, adopt device as claimed in claim 2, it is characterized in that, comprise the steps: that the continuous laser that (a) semiconductor laser (1) exports produces positive/negative first-order diffraction light through acousto-optic modulator (12) modulation, first completely reflecting mirror (16) will reflect by the positive/negative first-order diffraction light of outgoing after acousto-optic modulator (12) is modulated, this reverberation is input to alkali metal atom vaporium (22) by reflecting through multiple speculum and converged by the 5th convex lens (27) again after acousto-optic modulator (12) again, alkali metal atom is excited by ground state transition to some excitation state by the frequency of acousto-optic modulator (12) scanning continuous laser, b femtosecond laser that femto-second laser (20) is launched by () converges through the 3rd convex lens (21) along the direction contrary with continuous laser and is input to alkali metal atom vaporium (22), makes the alkali metal atom transitting to some excitation state transit to again another excitation state, c () converges alkali metal atom spontaneous radiation fluorescence by the 4th convex lens (24), obtained the two-photon spectrum of alkali metal atom ground state-some excitation state-another excitation state transition by photomultiplier (26) detection, d two-photon spectrum that () obtains obtains error signal through amplifier (29) input lock-in amplifier (31), and the current-modulation end that error signal is input to semiconductor laser (1) carrys out the frequency of stable shoot laser.
7. as claimed in claim 6 based on the laser frequency lock method of the hyperfine energy level spectrum of two-photon, it is characterized in that: described semiconductor laser (1) can adopt the laser of the different frequency launching 300nm to 1500nm.
8. as claimed in claim 7 based on the laser frequency lock method of the hyperfine energy level spectrum of two-photon, it is characterized in that: in described alkali metal atom vaporium (22), be filled with rubidium atom vapor; The continuous laser of 780nm launched by described semiconductor laser (1); Femto-second laser (20) launches 776nm femtosecond laser; Rubidium atom realizes the transition of the first step 5S-5P of two photon transition under the effect of semiconductor laser (1) Emission Lasers, the constant transition exciting the second step 5P-5D of rubidium atom two photon transition as pump light of frequency of femtosecond laser.
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| CN107069404A (en) * | 2017-06-15 | 2017-08-18 | 山西大学 | A kind of micromicrowatt level dim light Locking System |
| CN107096997A (en) * | 2017-05-10 | 2017-08-29 | 华中科技大学 | A kind of three-dimensional microstructures based on continuous laser inscribe system and method |
| CN108027587A (en) * | 2015-07-28 | 2018-05-11 | 国家科学研究中心 | Laser beam building mortion for atomic sensor |
| CN112858217A (en) * | 2021-03-12 | 2021-05-28 | 中国科学技术大学 | Device and spectrum appearance of dual wavelength method ration detection carbon 14 isotope |
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| CN108027587A (en) * | 2015-07-28 | 2018-05-11 | 国家科学研究中心 | Laser beam building mortion for atomic sensor |
| CN108027587B (en) * | 2015-07-28 | 2020-07-17 | 国家科学研究中心 | Laser beam shaping device for atom sensor |
| US11002977B2 (en) | 2015-07-28 | 2021-05-11 | Centre National de la Recherche Scientifique—CNRS | Device for shaping a laser beam for an atomic sensor having retroreflector prism, linear polarizer, and form birefringence plate |
| CN107096997A (en) * | 2017-05-10 | 2017-08-29 | 华中科技大学 | A kind of three-dimensional microstructures based on continuous laser inscribe system and method |
| CN107096997B (en) * | 2017-05-10 | 2019-09-24 | 华中科技大学 | A kind of three-dimensional microstructures inscription system and method based on continuous laser |
| CN107069404A (en) * | 2017-06-15 | 2017-08-18 | 山西大学 | A kind of micromicrowatt level dim light Locking System |
| CN107069404B (en) * | 2017-06-15 | 2019-04-05 | 山西大学 | A kind of micromicrowatt grade dim light Locking System |
| CN112858217A (en) * | 2021-03-12 | 2021-05-28 | 中国科学技术大学 | Device and spectrum appearance of dual wavelength method ration detection carbon 14 isotope |
| CN112858217B (en) * | 2021-03-12 | 2022-07-15 | 中国科学技术大学 | Device and spectrum appearance of dual wavelength method ration detection carbon 14 isotope |
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